Many states have enacted so-called stand your ground laws that remove the duty to retreat before using force in self-defense. Florida passed the first such law in 2005, generally
allowing people to stand their ground instead of retreating if they reasonably believe doing so will "prevent death or great bodily harm."
Other states followed with laws specifically affirming one's right to defend themselves, even outside of their homes and with deadly force if necessary. The wording of each state's laws will vary, but typically require you to have the right to be at a location. State self-defense laws may also overlap, but generally fall into three general categories:
Stand Your Ground: No duty to retreat from the situation before resorting to deadly force; not limited to your property (home, office, etc.).
Castle Doctrine: Limited to real property, such as your home, yard, or private office; no duty to retreat (use of deadly force against intruders is legal in most situations); some states, like Missouri and Ohio, even include personal vehicles.
Duty to Retreat: Must retreat from the situation if you feel threatened (use of deadly force is considered a last resort); may not use deadly force if you are safely inside your home.
Here are the states that have passed stand your ground laws:
States That Have Stand Your Ground Laws - FindLaw